Cleveland,ÎleChuginadak, Alaska :

AVO reported that during 29 July-4 August satellite images detected strongly elevated surface temperatures at Cleveland’s summit consistent with growth of a new lava dome. A field crew working in the area on 1 August reported frequent rockfalls on the volcano. A weak infrasound signal was much smaller than the explosion detected on 21 July; the signal may have been related to gas emissions, also consistent with lava-dome effusion. A very small gas plume was visible in webcam images during 2-3 August, and steam emissions were observed on 4 August.

Low-level unrest continues at Cleveland. Slightly elevated surface temperatures at the summit of the volcano were observed occasionally in satellite data over the past week. Occasional clear web camera views of the volcano showed only a small steam plume at the summit. On Tuesday, August 4 a field crew working in the area reported that a small amount of lava covered the crater floor. The surface temperatures of the solidified lava measured by the field crew were in the range of 550-600 Celsius (1000-1100 Fahrenheit), which is consistent with cooling lava. Minor ash and gas emissions also were observed. A small explosion occurred on Thursday, August 6 at 22:03 (08/07/15 06:03 UTC). No ash cloud was observed from this explosion, in satellite or web camera images or by observers. Observations of diffuse ash emissions and small explosions indicate that eruptive activity is still occurring. Further explosions could occur without warning.

Raung, Indonésie:

8.125°S, 114.042°E

Elevation 3332 m

On 4 August BNPB reported that during the previous three days the Strombolian eruption at Raung increased in intensity. Ash fell in Sempu, Songgon, Glenmore, Gambiran, and Banyuwangi. On 4 August dense blackish gray ash plumes rose 800 m and drifted SE. Based on satellite-image and wind data, the Darwin VAAC reported that during 29 July-4 August multiple ash plumes rose to altitudes of 4.3-4.9 km (14,000-16,000 ft) a.s.l. and drifted as far as 240 km in multiple directions. The Alert Level remained at 3 (on a scale of 1-4), and the public was reminded not to approach the crater within a 3-km radius.